Aeroplane



M. QUEMIN Aug. 8, 1933.

AEROPLANE Filed Feb. 16, 1932 TQR LLI/WML ATTO/M519 Patented Aug. 8, 1933 UNITED STA-TES PATENT @me .1,921,636 AEROPLANE Maurice Quemin, Le lMans, France Application February 16, 1932, Serial No. 593,216, and in France February 18, 1931 3 claims. (o1. 244-12) According to the present invention, inv order to Y permit the pilot to reduce the speed of his aeroplane whilst maintaining its stability, the main wing (or each main wing)4 of the machine is provided with a small auxiliary wing which re- .ceives from below air deflected froml the front i edge of the main wing which is suitably shaped or Y reduces the speed of vhis aeroplane.

disposed for this purpose. y

A supplementary sustaining effect results from the action of this risingr air on the small auxiliary wing, which ensures the maintenance of the stability of the aeroplane when the pilot reduces speed.

In the drawing attached hereto, various forms y of carrying out the invention are represented dial grammatically by Way of example. Y l

In the drawing Figure 1 is a part transverse section of the main wing of a monoplane; Figure 2 is a plan of the monoplane; Figures 3 and 4 are modifications` of the front of this wing. A is the main wing of an aeroplane of known construction. i

'Ihe front of this wing has a-concave shape at B, so that the air which strikes this concave portion is deected against asmall auxiliary supporting surface C mounted above the wing A from which it is carried by uprights C. This rising air impinging on the surface C, increases the lift of the machine. i n

The surface C can be fixed or may be adjustable in height; it can normally be positioned on the main Wing A or mounted in `a recess suitably formed in the upper portion of this wing, and is so arranged that it only rises to its operative position and to the height desired when the pilot effect this, a toothed pinion (l) and rackr(2) may be employed to effect thislmovement of the Vreference to the principal wing A,`and can havev In order to Vwing C. Any other control may lobviously be employed. b n

In place kof forming the front of the main wing A with a concave shape B, as in Figure 1, it `can ybe provided with a movable portion D l(Figureii) whichnormally provides the usual convex shape ofthe front of aeroplane wings, and whichcan'` t bema'de to pivot about 3,for example, vso as to give lthe front-of the wing a concave shapewhich will ensure the desired deiiection of air against the auxiliary surface C. l

Instead of providing'this deflection of air in an'upward direction by means of the concave surface, a screen or deilector E (Figure 4)' can be provided at the front of the Wing which may be plane or curved, and preferably movable.`

The auxiliary wing C kwill be located as is found necessary more or less forward or backward with either Zero angle of incidence with respect to the horizontal,v or such an angle as may be'found most eflicient; the angle of incidence may even be greater than the angle of incidence of the main wing if necessary. The breadth and length l of this auxiliary wing will, of course, be thatV found Y 7*,'5

most desirable.

It is to be noted `that this small auxiliary Wing placed above the 4main wing to receive an ascend# ing lcurrent of air deflected from the front ofthe main wing, with the object of increasing `the 80 stabilitytofy the aeroplane,v `is not inany way comparable with the small `auxiliary wings which are placed forward of and level with the front part of the main `wing on certain aeroplanesand have an angle of incidence 'less than that of the latter, with the object solely of suppressing what, is H called burbling In'thev case where the aeroplane, instead of being a monoplane, isa biplane or a triplane,v each of the main wings can Abe provided with a 90 small auxiliary wing similar to the small wing C, it being necessary to shape or dispose conven-k iently the front extremity of each one of these l main Wings so that they can deflectgusts of air l on'the smallauxiliary wings. .M95 What I claim isz- 1. In anaeroplane, the combination'of a'main supporting surface having at its front portion a` movable deflector plate which normallylies in an inoperative position, means vfor moving .the 1100 deector plate to a position in which it deects air upwardly and a small auxiliary supporting surface which is so located at the front of and above the main supporting surface that its underside is subjected to the action of the upwardly deected air.

2. In an aeroplane wing, the combination of a pivotal deflecting plate provided at the front edgeof the wing, with a small auxiliary supporting surface located above and slightly behind said deflecting plate, such that the underside of said small auxiliary supporting surface is sub.

6o A 'i jected to the action of the air deflected by the said deecting plate.

3. In an aeroplane Wing, the combination ofV a y 

